Method for manufacturing a ready-to-use catch pit

ABSTRACT

A method for making a catch-pit, such as the catch-pits often associated with underground pipeline junctions, manholes, or the like, where it is desirable to join a horizontal pipe with a larger-diameter, vertical, hollow, cylindrical works by means of a cottering or sleeve joint. The method includes the use of a removable profile component at the time the wall element of the pit or manhole is manufactured, to create a specially contoured opening in the wall to receive a correspondingly-shaped sleeve joint, which in turn receives the pipe.

The invention relates to a method of manufacturing a ready-for-use catchpit comprising a sump and a wall element placed on the sump, wherein thesump or the wall element is provided with at least a cottering or sleevejoint suitable for the connection of a sewage drain; wherein duringmanufacture of the catch pit, when the sump or the wall element ispoured, a removable profile component is incorporated in the wallelement; and wherein after the wall element is set, the profilecomponent is removed, producing an orifice in the sump or the wallelement for receiving the cottering or sleeve joint.

Such a method of manufacturing a catch pit is known from DE-A-25 53 388.The catch pit manufactured according to this citation is rectangular inshape, rendering the manufacture of the orifices that are intended toreceive the cottering or sleeve joint fairly easy. The connection of thecottering or sleeve joint according to DE-A-25 53 388 is cone-shaped inorder to adapt to different circumstances that may exist when connectingthe catch pit to a sewage drain.

DE-A-21 50 019 also teaches a rectangularly-shaped catch pit withprovisions for connecting a sewage drain according to the known art.When applying this known art in the manufacture of a catch pit having asubstantially cylindrical shape, this poses severe problems which willbe explained with reference to FIGS. 1(a)-(i).

The method of manufacturing a catch pit with a diameter of 1000 mm isexplained by means of FIGS. 1(a)-((i), which catch pit is provided witha sleeve having a diameter of 500 mm. FIGS. 1(a) and (b) show a top viewand cross-sectional side view of a wall element 1 intended for a catchpit. FIG. 1(c) shows the situation wherein the wall element 1 isprovided with an orifice 2. In and around the orifice 2 an attachment 3,an insert piece 4, and a pipe element 5 is provided, as shown in FIGS.1(d) and (e) in a cross-sectional side view and top view. FIGS. 1(f) and(g) once again show in cross-sectional side view and top view theassembly of the wall element 1, the attachment 3, the insert piece 4 andthe pipe element 5. By way of completion and in order to connect theparts, they will be concreted in as indicated by arrow 6. After thisoperation the floor 7 is poured, see FIG. 1(h). FIG. 1(i) shows theready catch pit. This known method entails difficult work conditionsassociated with the pouring of the floor 7, putting in the steelelements 3, 4 and 5 which are heavy of themselves, and in particular thenecessity of using heavy concrete ribs to fit into the recesses betweenthe wall element and the cottering or sleeve joint. Also thecomplexities of the shape of the orifice require that in themanufacturing method according to the state of the art, quite thick wallelements must be used in manufacturing the substantially cylindricalcatch pit.

The object of the invention is now to provide a method for manufacturinga catch pit, which manufacturing method is greatly simplified and withwhich it is possible to use wall elements having much reducedthicknesses.

According to the invention, a method of manufacturing a catch pit havinga substantially cylindrical shape is proposed, wherein the profileelement is incorporated in the cylindrical wall element therebyfollowing its curvature, which profile element is provided with aprotrusion extending into the catch pit's interior so as to cause thatafter the profile element's removal, the orifice narrows in steps towardthe interior, defining a sideways extending rim, and that the cotteringor sleeve joint is placed onto the sideways extending rim of theorifice. This provides the advantage that instead of making suitablearrangements to the catch pit's wall as is required in the prior art,the cottering or sleeve joint may be adapted to receive differingdiameters of sewage drains. The manufacturing process of the catch pitcan therefore remain unchanged, which provides clear benefits over theprior art, which would require complex rearrangements in themanufacturing of the catch pit per se.

Correspondingly, the catch pit manufactured according to the inventionis characterized in that the sump or the wall element is provided withan orifice which narrows in steps toward the interior, defining asideways extending rim, and that the cottering or sleeve joint is placedonto the sideways extending rim of the orifice.

The invention will now be explained in more detail with reference to thedrawing, in which

FIGS. 1(a)-(f) show the method and catch pit according to the state ofthe art, wherein:

FIG. 1(a) is a top view;

FIG. 1(b) is a cross-sectional side view;

FIG. 1(c) is a cross-sectional side view with a wall orifice;

FIG. 1(d) is a cross-sectional side view with the wall orifice andshowing an attachment, insert piece, and pipe element prior to assembly;

FIG. 1(e) is a top view with the wall orifice and showing theattachment, insert piece, and pipe element prior to assembly;

FIG. 1(f) is is a cross-sectional side view with the wall orifice andshowing an attachment, insert piece, and pipe element after assembly;

FIG. 1(g) is is a top view with the wall orifice and showing theattachment, insert piece, and pipe element after assembly;

FIG. 1(h)is a cross-sectional side view showing the pouring of a floor;and

FIG. 1(i) is a cross-sectional side view of the completed catch pit; and

FIGS. 2(a)-(d) show the method and catch pit according to the invention,wherein:

FIG. 2(a) is a top view of a wall element with a removed shrinkage core;

FIG. 2(b) is a cross-sectional side view of a wall element with aremoved shrinkage core;

FIG. 2(c) is a side view of a coffering element;

FIG. 2(d) is a frontal view of the coffering element;

FIG. 2(e) is a horizontal cross-sectional view of the cottering element;

FIG. 2(f) is a vertical cross-sectional view of the cottering element;

FIG. 2(g) is a top view of the wall element and the cottering elementprior to assembly;

FIG. 2(h) is a cross-sectional side view of the wall element and thecottering element prior to assembly; and

FIG. 2(i) is a cross-sectional side view of the completed catch pit.

With regard to the description of the state of the art as shown in FIGS.1(a)-(i), reference is made to the above.

FIGS. 2(a)-(i) show under FIGS. 2(a) and (b) top and cross-sectionalside views of a wall element 1 for a catch pit, in which during pouringof the wall element, a steel ring profile with shrinkage core 8 wasprovided, which in FIGS. 2(a) and (b) is shown in the removed state. Byremoving this profile element 8, an orifice 2 is created in the wallelement 1. Through the form of the profile element 8, the orifice 2 isprovided with a recess which narrows in steps having a sidewaysextending rim 9. A separate fitting piece, forming the cottering orsleeve joint, has to be attached in the orifice 2 onto the sidewaysextending rim 9 to provide the finished catch pit. FIGS. 2(c)-(f) show asuitable cottering element from different views, namely starting at thetop left, a side view, and from there clockwise a view as intended forplacing onto the sideways extending rim 9 of the wall element 1, ahorizontal cross section and a vertical cross section. FIGS. 2(g) and(h) show again the wall element 1 with the orifice 2, in top view andcross-sectional side view, as well as the cottering element 10 that isto be inserted into the orifice 2. Prior to fitting the cotteringelement 10 into the orifice 2, a layer of adhesive 11 is provided on thesideways extended rim 9 of the orifice 2, and optionally also on the rimextending radially sideways and from the rim 9. The cottering element 10fits into said orifice and due to the adhesive bonding the integral andready catch pit is provided as shown in FIG. 2(d).

The catch pit manufactured according to the invention may be providedwith a wall element 1 which is less thick than the catch pit accordingto the state of the art.

What is claimed is:
 1. A method of manufacturing a ready-for-use catchpit having a substantially cylindrical shape, the catch pit comprising asump and a wall element placed on the sump, the method comprising thesteps of: during manufacture of the catch pit, when the wall element ispoured, incorporating a removable profile component in the wall elementthereby following its curvature; providing the wall element with anannular cottering or sleeve joint adapted to receive a sewage drainpipe, and having an end defining an arcuate profile corresponding tosaid curvature of said wall element; and after the wall element is set,removing the profile component, thereby producing an orifice in the wallelement for receiving the cottering or sleeve joint, wherein the profilecomponent comprises a protrusion extending into the catch pit's interiorso as to cause that after the profile component's removal, the orificenarrows in steps toward the interior, defining a sideways extending rim,and wherein said end of said cottering or sleeve joint defining anarcuate profile is placed onto the sideways extending rim of theorifice.
 2. A catch pit comprising a sump, a substantially cylindricalwall element placed on the sump, and suitable to receive thereon a coneprovided with a manhole, wherein the wall element is provided with arecess which narrows in steps toward the interior, defining a sidewaysextending rim, and wherein a cottering or sleeve joint having an enddefining a profile corresponding to the curvature of said wall elementis placed onto the sideways extending rim of the recess.
 3. A catch pitaccording to claim 2 wherein the cottering or sleeve joint is bondedwith the sideways extending rim of the recess by means of adhesive.